tell-me-three-times has been around a long, long time - just about as long as computer themselves. I remember hearing about it when visiting my dad at one of the physics plants he was working at (working for his PhD)..

The concept of 'how important is this decision' is pretty keen, though.

DJ - the article mentioned that NASA uses hardened chips - the transistors require more energy to flip than is normally derived from the passage of a cosmic ray. The problem is they are slow, hot, and heavy - makes much more sense to sacrifice a little weight for a redundant system (heck, I use redundant (2x) systems at work every day)